QuickTime Player from Apple allows the playback of quicktime movies (.mov) and many other formats.
The new QuickTime Player not only delivers startling quality, but it's easier to use than ever. It requires no set up for content that streams over the network. Instead, QuickTime Player automatically determines your system's connection speed and chooses the highest quality stream for the amount of bandwidth you have available. And if you ever lose a connection while watching streaming video, QuickTime Player automatically reconnects. Now, thats convenience.
Playback of 3GPP and 3GPP2 files
Playback of MPEG-4 video, H.274, AAC audio & Instant-On media